Describe the bug

When I try to load my world, I get an error message, and it tells me I can only play in 'Safe Mode' (Using vanilla data packs only, non-modded) and when I try to create a new world, it force quits minecraft.

Steps to reproduce

Install using Forge version 52.0.29 and Minecraft version 1.21.1, attempt to load/create a world. (I am using the forge launcher, unsure if it does the same when installed manually)

Expected behavior

No response

Additional context

No response

Thanks for reporting, I will investigate

I was able to trace the problem back to this pull request, which changed the forge common tags to use the c namespace instead. Referencing the old forge tags will now cause the game to crash.
This will be fixed in the next release